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Fair Value Measures - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Carrying Value
Financial Assets:
Cash and cash equivalents	$ 12,890	$ 11,475
FHLB and FRB stock	1,550	1,392
Loans and leases held for investment, net	81,112	83,627
Financial Liabilities:
Deposits	74,858	81,526
Borrowed funds	26,727	21,267
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	12,890	11,475
FHLB and FRB stock	1,550	1,392
Loans and leases held for investment, net	76,458	79,333
Financial Liabilities:
Deposits	74,755	81,247
Borrowed funds	26,651	21,082
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and cash equivalents	12,890	11,475
FHLB and FRB stock	0	0
Loans and leases held for investment, net	0	0
Financial Liabilities:
Deposits	48,095	59,972
Borrowed funds	0	0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Financial Assets:
Cash and cash equivalents	0	0
FHLB and FRB stock	1,550	1,392
Loans and leases held for investment, net	0	0
Financial Liabilities:
Deposits	26,660	21,275
Borrowed funds	26,651	21,082
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and cash equivalents	0	0
FHLB and FRB stock	0	0
Loans and leases held for investment, net	76,458	79,333
Financial Liabilities:
Deposits	0	0
Borrowed funds	$ 0	$ 0

X

- Definition

Federal Home Loan Bank and Federal Reserve Bank Stock, Fair Value Disclosure

+ References

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Publisher FASB
-URI https://asc.fasb.org//310-10/tableOfContent

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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